<template>
	<div>
		<!-- 面包屑导航区 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>参数列表</el-breadcrumb-item>
    </el-breadcrumb>

		<!-- 卡片 -->
		<el-card>
			<el-alert
				title="注意：只允许为第三级分类设置相关参数！"
				:closable="false"
				show-icon
				type="warning">
			</el-alert>

			<!-- 选择商品分类区 -->
			<el-row class="cat_opt">
				<span>选择商品分类：</span>
				<!-- 选择商品分类的级联选择框 -->
				<el-cascader
					expand-trigger="hover"
					:options="catelist"
					:props="cateProps"
					v-model="selectedCateKeys"
					@change="handleChange">
				</el-cascader>
			</el-row>

			<!-- tab -->
			<el-tabs v-model="activeName" @tab-click="handleTabClick">
				<el-tab-pane label="动态参数" name="many">
					<el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="addDialogVisible = true">添加参数</el-button>
					<el-table :data="manyTableData" border stripe>
						<el-table-column type="expand">
							<template slot-scope="scope">
								<el-tag class="tag_in" closable :key="i" v-for="(item, i) in scope.row.attr_vals">{{item}}</el-tag>
								<el-input
								class="input-new-tag"
								v-if="scope.row.inputVisible"
								v-model="scope.row.inputValue"
								ref="saveTagInput"
								size="small"
								@keyup.enter.native="handleInputConfirm(scope.row)"
								@blur="handleInputConfirm(scope.row)"
								>
								</el-input>
								<el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
							</template>
						</el-table-column>
						<el-table-column type="index"></el-table-column>
						<el-table-column label="参数名称" prop="attr_name"></el-table-column>
						<el-table-column label="操作">
							<template slot-scope="scope">
								<el-button type="primary" icon="el-icon-edit" size="mini" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
								<el-button type="danger" icon="el-icon-delete" size="mini" @click="removeParams(scope.row.attr_id)">删除</el-button>
							</template>
						</el-table-column>
					</el-table>
				</el-tab-pane>

				<el-tab-pane label="静态属性" name="only">
					<el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="addDialogVisible = true">添加属性</el-button>
					<el-table :data="onlyTableData" border stripe>
						<el-table-column type="expand">
							<template slot-scope="scope">
								<el-tag closable :key="i" v-for="(item, i) in scope.row.attr_vals">{{item}}</el-tag>
								<el-input
								class="input-new-tag"
								v-if="scope.row.inputVisible"
								v-model="scope.row.inputValue"
								ref="saveTagInput"
								size="small"
								@keyup.enter.native="handleInputConfirm(scope.row)"
								@blur="handleInputConfirm(scope.row)"
								>
								</el-input>
								<el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
							</template>
						</el-table-column>
						<el-table-column type="index"></el-table-column>
						<el-table-column label="属性名称" prop="attr_name"></el-table-column>
						<el-table-column label="操作">
							<template slot-scope="scope">
								<el-button type="primary" icon="el-icon-edit" size="mini" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
								<el-button type="danger" icon="el-icon-delete" size="mini" @click="removeParams(scope.row.attr_id)">删除</el-button>
							</template>
						</el-table-column>
					</el-table>
				</el-tab-pane>
			</el-tabs>
		</el-card>

		<!-- 添加参数的对话框 -->
		<el-dialog
			:title="'添加' + titleText"
			:visible.sync="addDialogVisible"
			@close="addDialogClosed"
			width="50%">
			<el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px">
				<el-form-item :label="titleText" prop="attr_name">
					<el-input v-model="addForm.attr_name"></el-input>
				</el-form-item>
			</el-form>
			<span slot="footer" class="dialog-footer">
				<el-button @click="addDialogVisible = false">取 消</el-button>
				<el-button type="primary" @click="addParams">确 定</el-button>
			</span>
		</el-dialog>
		<!-- 修改参数的对话框 -->
		<el-dialog
			:title="'修改' + titleText"
			:visible.sync="editDialogVisible"
			@close="editDialogClosed"
			width="50%">
			<el-form :model="editForm" :rules="editFormRules" ref="editFormRef" label-width="100px">
				<el-form-item :label="titleText" prop="attr_name">
					<el-input v-model="editForm.attr_name"></el-input>
				</el-form-item>
			</el-form>
			<span slot="footer" class="dialog-footer">
				<el-button @click="editDialogVisible = false">取 消</el-button>
				<el-button type="primary" @click="editParams">确 定</el-button>
			</span>
		</el-dialog>
	</div>
</template>

<script>
export default {
	data() {
		return {
			catelist: [],
			// 级联选择框的配置对象
			cateProps: {
				value: 'cat_id',
				label: 'cat_name',
				children: 'children'
			},
			// 级联选择框双向绑定的数组
			selectedCateKeys: [],
			activeName: 'many',
			manyTableData: [],
			onlyTableData: [],
			// 控制添加对话框的添加与隐藏
			addDialogVisible: false,
			addForm: {
				attr_name: ''
			},
			addFormRules: {
				attr_name: [
					{ required: true, message: '请输入参数名称', trigger: 'blur' }
				]
			},
			editDialogVisible: false,
			editForm: {
				attr_name: ''
			},
			editFormRules: {
				attr_name: [
					{ required: true, message: '请输入参数名称', trigger: 'blur' }
				]
			}
		}
	},
	created() {
		this.getCateList()
	},
	methods: {
		async getCateList() {
			const {data: res} = await this.$http.get('categories')
			if(res.meta.status !== 200) {
				return this.$message.error('获取商品分类失败')
			}
			this.catelist = res.data
			console.log(this.catelist);
		},
		handleChange() {
			this.getParamsData()
		},
		handleTabClick() {
			console.log(this.activeName);
			this.getParamsData()
		},
		async getParamsData() {
			// 证明选择的不是三级分类
			if(this.selectedCateKeys.length !== 3) {
				this.selectedCateKeys = []
				this.manyTableData = []
				this.onlyTableData = []
				return
			}
			const {data: res} = await this.$http.get(`categories/${this.cateId}/attributes`, {params: {sel: this.activeName}})
			if(res.meta.status !== 200) {
				return this.$message.error('获取参数列表失败')
			}
			res.data.forEach((item=>{
				item.attr_vals = item.attr_vals ? item.attr_vals.split(',') : []
				// 控制文本框的显示与隐藏
				item.inputVisible  = false
				item.inputValue = ''
			}))
			console.log(res.data);
			if(this.activeName === 'many') {
				this.manyTableData = res.data
			} else {
				this.onlyTableData = res.data
			}
		},
		addDialogClosed() {
			this.$refs.addFormRef.resetFields()
		},
		addParams() {
			this.$refs.addFormRef.validate(async valid=>{
				if(!valid) return
				const {data: res} = await this.$http.post(`categories/${this.cateId}/attributes`, {attr_name: this.addForm.attr_name, attr_sel: this.activeName})
				if(res.meta.status !== 201) {
					return this.$message.error('添加参数失败')
				}
				this.$message.success('添加参数成功')
				this.addDialogVisible = false
				this.getParamsData()
			})
		},
		async showEditDialog(attr_id) {
			const {data: res} = await this.$http.get(`categories/${this.cateId}/attributes/${attr_id}`, {
				params: {attr_sel: this.activeName}
			})
			if(res.meta.status !== 200) {
				return this.$message.error('获取参数信息失败')
			}
			this.editForm = res.data
			console.log(this.editForm);
			this.editDialogVisible = true
		},
		editDialogClosed() {
			this.$refs.editFormRef.resetFields()
		},
		editParams() {
			this.$refs.editFormRef.validate(async valid=>{
				if(!valid) return
				const {data: res} = await this.$http.put(`categories/${this.cateId}/attributes/${this.editForm.attr_id}`, {
					attr_name: this.editForm.attr_name, 
					attr_sel: this.activeName
				})
				if(res.meta.status !== 200) {
					return this.$message.error('修改参数失败')
				}
				this.$message.success('修改参数成功')
				this.getParamsData()
				this.editDialogVisible = false
			})
		},
		async removeParams(attr_id) {
			const confirmResult = await this.$confirm('此操作将永久删除该参数, 是否继续?', '提示', {
			confirmButtonText: '确定',
			cancelButtonText: '取消',
			type: 'warning'
			}).catch(err => err)
			if(confirmResult !== 'confirm') {
				return this.$message.info('已取消删除')
			}
			const {data: res} = await this.$http.delete(`categories/${this.cateId}/attributes/${attr_id}`)
			if(res.meta.status !== 200) {
				return this.$message.error('删除参数失败')
			}
			this.$message.success('删除参数成功')
			this.getParamsData()
		},
		// 文本框失去焦点或者按下了enter键
		async handleInputConfirm(row) {
			if(row.inputValue.trim().length === 0) {
				row.inputValue = ''
				row.inputVisible = false
				return
			}
			row.attr_vals.push(row.inputValue.trim())
			row.inputValue = ''
			row.inputVisible = false
			const {data: res} = await this.$http.put(`categories/${this.cateId}/attributes/${row.attr_id}`, {
				attr_name: row.attr_name,
				attr_sel: row.attr_sel,
				attr_vals: row.attr_vals.join(',')
			})
			if(res.meta.status !== 200) {
				return this.$message.error('修改失败')
			}
			this.$message.success('添加成功')
		},
		showInput(row) {
			row.inputVisible = true
			this.$nextTick(_ => {
				this.$refs.saveTagInput.$refs.input.focus();
			});
		}
	},
	// 计算属性
	computed: {
		// 如果按钮需要被禁用，则返回true，否则返回false
		isBtnDisabled() {
			if(this.selectedCateKeys.length !== 3) {
				return true
			}
			return false
		},
		// 选中的三级分类的Id
		cateId() {
			if(this.selectedCateKeys.length === 3) {
				return this.selectedCateKeys[2]
			}
			return null
		},
		// 动态计算标题的文本
		titleText() {
			// 如果激活的是动态参数面板则让对话框文本是添加动态参数
			// 如果激活的是静态属性面板则对话框文本是添加静态属性
			if(this.activeName === 'many') {
				return '动态参数'
			} else {
				return '静态属性'
			}
		}
	}
}
</script>

<style lang="less" scoped>
.cat_opt {
	margin: 15px 0;
}
.input-new-tag {
	width: 120px;
}
.tag_in {
	margin: 5px;
}
</style>